Solve any triangle using the Law of Sines or Cosines. Enter 3 known values (sides/angles) to find the rest.
Law of Sines & Cosines
Math
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Enter any 3 known values — sides (a, b, c) and/or angles in degrees (A, B, C).
You must include at least one side (not just angles).
Click Calculate to solve for all remaining sides and angles.
Law of Sines: a/sin(A) = b/sin(B) = c/sin(C). Law of Cosines: c² = a² + b² − 2ab·cos(C). Together these solve any triangle given SSS, SAS, AAS, or ASA combinations.
Use Sines for AAS/ASA. Use Cosines for SAS/SSS. Cosines is more general but requires more computation.